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08-Jan-2020 07:52

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A total of 50 paintings in 11 caves in Northern Spain, including the UNESCO World Heritage sites of Altamira, El Castillo and Tito Bustillo, were dated by a team of UK, Spanish and Portuguese researchers led by Dr Alistair Pike of the University of Bristol, UK.As traditional methods such as radiocarbon dating do not work where there is no organic pigment, the team dated the formation of tiny stalactites on top of the paintings using the radioactive decay of uranium. Where larger stalagmites had been painted, maximum ages were also obtained.Instead, the decay of Thorium and the production of Thorium reach a form of balance - called secular equilibrium.Our editors will review what you’ve submitted and determine whether to revise the article.Join Britannica's Publishing Partner Program and our community of experts to gain a global audience for your work!The important characteristic of common lead is that it contains no significant proportion of radiogenic lead accumulated since the time that the mineral or rock phase was formed.You may now see our list and photos of women who are in your area and meet your preferences.Again, please keep their identity a secret Click on the "Continue" button search with your zip/postal code.

Uranium is often found in trace amounts in certain types of rock and is radioactive.The lead incorporated within the Earth has been evolving continuously from primordial lead and from the radioactive decay of uranium and thorium isotopes.Thus, the lead isotopic composition of any mineral or rock depends upon its age and the environment from which it was formed; that is, it would depend upon the ratio of uranium plus thorium to lead in the parent material.Paleolithic paintings in El Castillo cave in Northern Spain date back at least 40,800 years -- making them Europe's oldest known cave art, according to new research.

Scientists found that the practice of cave art in Europe began up to 10,000 years earlier than previously thought, indicating the paintings were created either by the first anatomically modern humans in Europe or, perhaps, by Neanderthals.Differential solubility between uranium and its long lived daughter isotope Th is measured using MC-ICPMS.



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